kselftest/arm64: Skip VL_INHERIT tests for unsupported vector types

Currently we unconditionally test the ability to set the vector length inheritance flag via ptrace meaning that we generate false failures on systems that don't support SVE when we attempt to set the vector length there. Check the hwcap and mark the tests as skipped when it's not present. Fixes: 0ba1ce1 ("selftests: arm64: Add coverage of ptrace flags for SVE VL inheritance") Signed-off-by: Mark Brown <[email protected]> Reviewed-by: Shuah Khan <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Catalin Marinas <[email protected]>
dedewu6 · Jan 28, 2022 · 50806fd · 50806fd
1 parent 3758a6c
commit 50806fd
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/tools/testing/selftests/arm64/fp/sve-ptrace.c b/tools/testing/selftests/arm64/fp/sve-ptrace.c
@@ -557,7 +557,14 @@ static int do_parent(pid_t child)
 		}
 
 		/* prctl() flags */
-		ptrace_set_get_inherit(child, &vec_types[i]);
+		if (getauxval(vec_types[i].hwcap_type) & vec_types[i].hwcap) {
+			ptrace_set_get_inherit(child, &vec_types[i]);
+		} else {
+			ksft_test_result_skip("%s SVE_PT_VL_INHERIT set\n",
+					      vec_types[i].name);
+			ksft_test_result_skip("%s SVE_PT_VL_INHERIT cleared\n",
+					      vec_types[i].name);
+		}
 
 		/* Step through every possible VQ */
 		for (vq = SVE_VQ_MIN; vq <= SVE_VQ_MAX; vq++) {